Cooling unit and illuminating apparatus

1. A cooling unit comprising: a blowing device having a frame configured to rotatably support a blower including plurality of blades; and a heat sink having a central recess portion configured to accommodate the plurality of blades of the blower within the central recess portion and a plurality of heat radiation plates provided to surround the central recess portion, wherein the frame of the blowing device is pivotably supported by an engaging element of the heat sink provided outside the central recess portion such that the plurality of blades of the blower of the blowing device are pivotably displaceable between a first position at which the plurality of blades of the blower are disposed outside the central recess portion and a second position at which the plurality of blades of the blower are accommodated within the central recess portion.

2. The cooling unit according to claim 1 , wherein the blower includes a plurality of blades that extend radially from a central portion, the frame includes a first support that rotatably supports the central portion, a second support that extends from the first support, and a first axis forming member provided in the second support at a position that faces away from the plurality of blades when viewed from a rotation axis of the central portion, the heat sink includes a second axis forming member that is engaged with the first axis forming member to form a pivot axis, and the blowing device is configured to be pivotabe around the pivot axis between the first position and the second position.

3. The cooling unit according to claim 2 , wherein the blowing device includes a third support that extends from the first support in a direction different from the extension direction of the second support, and the third support extends to a position that faces away from the plurality of blades when viewed from a rotation axis of the central portion.

4. The cooling unit according to claim 3 , wherein the first axis forming member is a shaft that extends in a direction of the pivot axis, and the second axis forming member is a bearing having a groove into which the shaft is inserted.

5. The cooling unit according to claim 2 , wherein the first axis forming member is a shaft that extends in a direction of the pivot axis, and the second axis forming member is a bearing having a groove into which the shaft is inserted.

6. An illuminating apparatus comprising: a semiconductor light emitting element; a light transmitting member configured to transmit a light emitted from the semiconductor light emitting element; a blowing device having a frame configured to rotatably support a blower including a plurality of blades; and having a central recess portion configured to accommodate the plurality of blades of the blower within the central recess portion and a plurality of heat radiation plates provided to surround the central recess portion: wherein the frame of the blowing device is pivotably supported by an engaging element of the heat sink provided outside the central recess portion such that the plurality of blades of the blower of the blowing device are displaceable between a first position at which the plurality of blades of the blower are disposed outside the central recess portion, and a second position at which the plurality of blades of the blower are accommodated within the central recess portion.